Abstract
The variation of the superconducting transition temperatureT c in (Nb1−y M y )3− Al1−x Ge x composite systems, where M is one of the IVB transition elements Ti, Zr, or Hf, was studied. It was found that the transition metal group dominates in determining theT c of the system. The variation ofT c is shown to be similar for all three IVB elements reflecting the similarity of the behavior ofT c for Nb1−yM y binary alloys. The behavior of the binary alloys is analyzed in terms of the McMillan equation to test the importance of the electronic density of states N(O) in determining the electron-phonon coupling constant λ. TheT c variation for M equal to Zr was investigated for the entire range ofx andy from 0 to I. The transition temperature is qualitatively independent ofx suggesting that only physical quantities relevant to the transition metal alone influence the transition temperature.
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